ASTM D923 - 07

    Standard Practices for Sampling Electrical Insulating Liquids

    Active Standard ASTM D923 | Developed by Subcommittee: D27.07

    Book of Standards Volume: 10.03


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    Significance and Use

    1. Scope

    1.1 These practices cover sampling of new electrical insulating liquids including oils, askarels, silicones, synthetic liquids, and natural ester insulating liquids as well as those insulating liquids in service or subsequent to service in cables, transformers, circuit breakers, and other electrical apparatus. These practices apply to liquids having a viscosity of less than 6.476 10-4 m2/s (540 cSt) at 40°C (104°F).

    1.2 Representative samples of electrical insulating liquids are taken for test specimens so that the quality pertinent to their use may be determined. The quality in different portions of a given container, or the average quality of the whole bulk may be ascertained if desired.

    1.3 The values stated in SI units are regarded as the standard where applicable. Inch pound units are used where there is no SI equivalent.

    1.4 These practices also include special techniques and devices for sampling for dissolved gases-in-oil (DGA) (D 3612), water (D 1533) and particles (D 6786).

    1.5 For ease of use, this document has been indexed as follows:

    1.6 Handle askarels containing polychlorinated biphenyls (PCBs) according to federal and local regulations existing for that country. For example, the federal regulations concerning PCBs in the United States can be found in 40 CFR Part 761.

    1.7 Properly contain, package and dispose of any liquid or material resulting from the use of these practices in a manner that is in accordance with local and state regulations specific to the country in which the samples are taken.

    This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in 1.6, 1.7, Section 5, 10.1, 13.2, 15.2.3, Section 16, and 18.2. These practices involve close contact with the electrical insulating liquids being sampled as well as liquids and other materials used to clean the sampling tools and devices. When required, or as a matter of diligence to personal safety, use personal protective equipment (PPE).


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1533 Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration

    D1933 Specification for Nitrogen Gas as an Electrical Insulating Material

    D3612 Test Method for Analysis of Gases Dissolved in Electrical Insulating Oil by Gas Chromatography

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D6786 Test Method for Particle Count in Mineral Insulating Oil Using Automatic Optical Particle Counters


    ICS Code

    ICS Number Code 29.040.10 (Insulating oils)

    UNSPSC Code

    UNSPSC Code 15121505(Transformer oil or insulating oil)


    DOI: 10.1520/D0923-07

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